package cn.tedu.sp06zuul.fallback;


import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;


public class ItemFB implements FallbackProvider {
    //针对哪个服务应用当前降级类
    //返回服务id
    //    item-service -只针对商品服务降级
    //    *-通用对所有服务降级
    //    null-对所有服务降级
    @Override
    public String getRoute() {
        return "item-service";
    }
//返回的降级响应,封装在response 对象中
    //根据自己应用的需求,可以返回任意的相应数据
    //-错误提示
    //-缓存数据
    //-执行业务运算返回结果
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpHeaders getHeaders() {
               HttpHeaders h=new HttpHeaders();
               h.add("Content-Type", "application/json;charset=UTF-8");
               return h;

            }
            @Override
            public InputStream getBody() throws IOException {
                //JsonResult ----{code:500,msg:系统服务故障,data:null}
                String json= JsonResult.err().code(500).msg("系统服务故障").toString();
                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;//500
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();//500
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();//提示文本500
            }

            @Override
            public void close() {
                //BAIS 流是内存数组的流,不占用底层系统资源
                //不需要close9释放资源


            }
        };


    }
}
